TI-2023-13313 Aliases CVE-2023-28803 GHSA-mwvw-6ggj-fhv5

Traffic being bypassed by ZCC by configuring synthetic IP range as local network

LOW 29CWE-290Published 2023-10-23 · Updated 2024-09-11

Key facts

Attack vector: Adjacent network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: None · High · None
Fix status: Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-290.

Summary

An authentication bypass by spoofing of a device with a synthetic IP address is possible in Zscaler Client Connector on Windows, allowing a functionality bypass. This issue affects Client Connector: before 3.9.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00292 21st percentileScored 2026-11-07

Fix Fixed Client Connector (Zscaler): 3.9

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Zscaler	Client Connector	before 3.9	3.9	Patch available	CNA

Client Connector VendorZscaler Affected before 3.9 Fixed in 3.9 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:zscaler:client_connector::::::windows::*	before 3.9	Vulnerable	Zscaler

cpe:2.3:a:zscaler:client_connector:*:*:*:*:*:windows:*:* Versions before 3.9 Vulnerable ·Zscaler

Remediation

Fix · CNA Client Connector (Zscaler) Fixed in 3.9

Timeline

2026-10-02 Threatist record created from CVE-2023-28803
2026-10-03 Alias added: GHSA-mwvw-6ggj-fhv5

References

Other 1

https://help.zscaler.com/client-connector/client-connector-app-release-summary-2023

TI-2020-09334 The Zscaler Client Connector for Windows prior to 2.1.2.74 had a stack based buffer… CVSS 3.1CRITICAL 9.8
TI-2024-15528 Local Privilege Escalation via lack of input validation CVSS 3.1CRITICAL 9.8
TI-2024-15526 Insecure MacOS code sign check fallback CVSS 3.1CRITICAL 9.8
TI-2024-15505 Multiple Arbitrary Creates/Overwrites by link following CVSS 3.1CRITICAL 9.8
TI-2023-13308 Out-of-bounds write to heap in pacparser CVSS 3.1CRITICAL 9.8
TI-2023-13315 ZCC on Linux privilege escalation CVSS 3.1CRITICAL 9.8

See all 40 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences